It "worked" only if the definition is "it removed it from Reddit".
As the article mentions, these people did not just disappear or change their mind. They just moved to more obscure places, where they can continue and be evem more motivated, because now they have been censored.
And you might still consider this to be a satisfiable definition for "it worked". Out of sight, out of mind.
Except that, these people are now relegated to an echo chamber far from public discourse where they will only reinforce their views without challenge. An echo chamber that is now suddenly more appealing, because it's forbidden.
Recently, in an episode of the Joe Rogan Podcast with Tim Pool, Jack Dorsey and Vijaya Gadde, Jack admitted that a woman that was part of the Westboro Baptist Church changed her mind only becasue she was allowed to be on Twitter and be exposed to other points of view.
So, from the point of society, I don't think it ever works to pushi extremists to the underground. Sure, Reddit does not have any obligation to give them a place to gather. But still, maybe it should anyway?
EDIT: Reading other comments here, I also got reminded of the fact that, before Hitler got to power, Germany had hate speech laws that explecitly forbid nazi propaganda. Many were sent to jail for that, which only contributed to their determination and their spreading.
So, if you are concerned that being allowed in the public allows them to spread their views, do not be so sure that pushing them away is going to stop them. You might just do them a favor.